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Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Spin-gradient-driven light amplification in a quantum plasma.

Stefanie Braun¹, Felipe A Asenjo, Swadesh M Mahajan

¹Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA.

Physical Review Letters

|December 11, 2012

Summary

This summary is machine-generated.

Free energy gradients in spin quantum plasmas can destabilize light waves. This spin-inhomogeneity driven mechanism may enable light amplification in dense systems.

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Area of Science:

Plasma Physics
Quantum Mechanics
Electromagnetism

Background:

Spin quantum plasmas consist of mobile electrons and a neutralizing ion background.
Free energy gradients are present in equilibrium spin vorticity.

Purpose of the Study:

To investigate the potential for spin vorticity gradients to destabilize electromagnetic modes in spin quantum plasmas.
To explore the implications for light wave instability and amplification.

Main Methods:

Theoretical analysis of electromagnetic modes in spin quantum plasmas.
Examination of the role of free energy gradients from spin vorticity.

Main Results:

Gradient free energy in spin vorticity can destabilize electromagnetic modes, including light waves.
High growth rates observed for densities relevant to solid-state and astrophysical systems.
Growth rates exceed expected collisional damping.

Conclusions:

Spin-inhomogeneity driven mechanisms can stimulate light amplification.
This finding has implications for understanding light propagation in dense quantum plasmas.